1. 从mysql的官网下载mysql57-community-release-el6-8.noarch.rpm
2. 安装第一步下载的rpm
rpm -ivh mysql57-community-release-el6-8.noarch.rpm
3. 安装完成之后，我们发现在/etc/yum.repos.d目录下新增了两个文件：其中第二文件记录了mysql的源信息。
mysql-community.repo
mysql-community-source.repo
4. 查看可用的mysql安装源
yum repolist enabled | grep mysql 1 mysql-connectors-community MySQL Connectors Community 21
mysql-tools-community MySQL Tools Community 24
mysql57-community MySQL 5.7 Community Server 56
5. 使用yum安装mysql(自动解决依赖问题，并安装了其他相关包)（如果需要保存下载的包，则修改/etc/yum.conf，将
keepcache=0 改为keepcache=1）
yum install mysql-community-server
Installing:
mysql-community-libs i686 5.7.13-1.el6 mysql57-community 2.0 M
replacing mysql-libs.i686 5.1.73-3.el6_5
mysql-community-libs-compat i686 5.7.13-1.el6 mysql57-community 1.6 M
replacing mysql-libs.i686 5.1.73-3.el6_5
mysql-community-server i686 5.7.13-1.el6 mysql57-community 140 M
Installing for dependencies:
mysql-community-client i686 5.7.13-1.el6 mysql57-community 22 M
mysql-community-common i686 5.7.13-1.el6 mysql57-community 327 k
Updating for dependencies:
postfix i686 2:2.6.6-6.el6_7.1 base 2.0 M
Transaction Summary
==============================================================================================
Install 5 Package(s)
Upgrade 1 Package(s)
6 .安装完成之后，查看mysql服务的状态
sudo service mysqld status mysqld (pid 26422) is running...
7. 停止mysql服务，然后以安全模式启动mysql。
sudo service mysql stop
sudo mysqld_safe --skip-grant-tables --skip-networking &
8. 无密码登陆root, 设置root密码
mysql -u root mysql> use mysql;
mysql>update user set authentication_string=password('') where user='root';
mysql> flush privileges;
9. 修改字符集为utf8
vim /etc/my.cnf 在[mysqld]部分添加：
character-set-server=utf8 在文件末尾新增[client]段，在[client]段添加：
default-character-set=utf8
10. 查看字符
show variables like "%character%"; +--------------------------+----------------------------+
| Variable_name | Value |
+--------------------------+----------------------------+
| character_set_client | utf8 |
| character_set_connection | utf8 |
| character_set_database | utf8 |
| character_set_filesystem | binary |
| character_set_results | utf8 |
| character_set_server | utf8 |
| character_set_system | utf8 |
| character_sets_dir | /usr/share/mysql/charsets/ |
+--------------------------+----------------------------+